Update RELEASE_NOTES.txt
Update RELEASE_NOTES.txt

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avalentino/PyTables,andreabedini/PyTables,rabernat/PyTables,rabernat/PyTables,FrancescAlted/PyTables,rabernat/PyTables,rabernat/PyTables,PyTables/PyTables,PyTables/PyTables,PyTables/PyTables,andreabedini/PyTables,andreabedini/PyTables,FrancescAlted/PyTables,avalentino/PyTables,andreabedini/PyTables,FrancescAlted/PyTables,avalentino/PyTables